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* Reading limits shown include Model 6512 and Model 263 accuracy specifications.
5.5.3 Coulombs verification
Connect the Model 6512 to the Model 263 as shown in Figure 5-1, and perform coulombs verification as follows:
Figure 5-1
Connections for amps and coulombs verification
Table 5-1
Limits for amps verification
6512
263
263
range
function
output
20mA
AMPS
19.000mA
2mA
AMPS
1.90000mA
200µA
AMPS
190.000µA
20µA
AMPS
19.0000µA
2µA
AMPS
1.90000µA
200nA
AMPS
190.000nA
20nA
AMPS
19.0000nA
2nA
AMPS
1.90000nA
200pA
AMPS V/R
190.000pA
20pA
AMPS V/R
19.0000pA
2pA
AMPS V/R
1.90000pA
1. Using the COUL (active) charge source of the Model
263, select the 2nC range.
2. Place the Model 263 in the coulombs function, and per-
form zero correction by enabling zero check and zero
correct in that order.
3. Disable zero check on the Model 6512.
2-SL
TRIAX C
OUTPUT
MODEL 263
Allowable reading
(1 Year, 18°C-28°C)
18.978 - 19.022mA
1.8973 - 1.9027mA
189.76 - 190.24µA
18.976 - 19.024µA
1.8973 - 1.9027µA
189.59 - 190.41nA
18.965 - 19.035nA
1.8962 - 1.9038nA
187.45 - 192.55pA
18.770 - 19.230pA
1.8811 - 1.9189pA
4. Program the Model 263 to output 1.90000nC, and press
OPERATE to source charge to the Model 6512.
5. Verify that the Model 6512 reading is between 1.8943
and 1.9057nC.
5.5.4 Volts verification
Current and charge verification must be
performed before volts verification.
Connect the Model 6512 and 190V calibration source to the
Model 263, as shown in Figure 5-2, and perform volts verifi-
cation as follows:
1. On the Model 6512, enable zero check, and select the
200mV range.
2. Check to see that the display reads 000.00 ±1 count. If
not, enable zero correct.
3. Program the Model 263 to output 190.000mV.
4. Disable zero check, and verify that the reading on the
Model 6512 is within the limits listed in Table 5-2.
5. Using Table 5-2 as a guide, repeat steps 1 through 4 for
the 2V and 20V ranges.
6. Set the Model 6512 to the 200V range.
7. Set the external calibration source to output 190.000V to
the Model 263.
8. Source 190.000V to the Model 6512 by pressing SHIFT
VOLTS on the Model 263.
9. Verify that the reading on the Model 6512 is within the
limits listed in the table.
Performance Verification
NOTE
5-3
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